311 results on '"Yasuo, Yamamoto"'
Search Results
2. Doubly Robust Off-Policy Evaluation for Ranking Policies under the Cascade Behavior Model.
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Haruka Kiyohara, Yuta Saito, Tatsuya Matsuhiro, Yusuke Narita, Nobuyuki Shimizu, and Yasuo Yamamoto
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- 2022
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3. Investigation of DVFS based dynamic reliability management for chip multiprocessors.
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Milad Ghorbani Moghaddam, Alexandre Yasuo Yamamoto, and Cristinel Ababei
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- 2015
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4. Discovery of Apararenone (MT-3995) as a Highly Selective, Potent, and Novel Nonsteroidal Mineralocorticoid Receptor Antagonist
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Toru Iijima, Makoto Katoh, Kei Takedomi, Yasuo Yamamoto, Hidenori Akatsuka, Naritoshi Shirata, Akito Nishi, Misae Takakuwa, Yoshinori Watanabe, Hitomi Munakata, Naomi Koyama, Tomoko Ikeda, Taku Iguchi, Harutoshi Kato, Kohei Kikkawa, and Takayuki Kawaguchi
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Heart Failure ,Sulfonamides ,Receptors, Mineralocorticoid ,Oxazines ,Drug Discovery ,Animals ,Humans ,Molecular Medicine ,Antihypertensive Agents ,Eplerenone ,Mineralocorticoid Receptor Antagonists ,Rats - Abstract
Overactivation of the mineralocorticoid receptor (MR) is involved in many diseases, such as hypertension, kidney disease, and heart failure. Thus, MR antagonists (MRAs) are expected to be beneficial to patients with these diseases. In order to identify novel nonsteroidal MRAs that overcome the issues of already marketed steroidal MRAs, we searched for new compounds guided by our hypothesis that T-shaped compounds with a hydrophobic core structure, two polar functional groups at both extremities able to interact with MR, and a bulky substituent that can interfere with the folding of the C-terminal helix 12 may exhibit antagonist activity toward MR. We discovered that the novel 1,4-benzoxazin-3-one derivative
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- 2022
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5. Ureteral endometriosis with impairment of unilateral renal function at the time of initial examination: A report of three cases
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Yoshifumi Ochi, Shiori Yanai, Yasunori Yoshino, Kiyoshi Kanno, Tomonori Hada, Yasuo Yamamoto, Tadayoshi Kunitomo, and Masaaki Andou
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
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6. Unified system level reliability evaluation methodology for multiprocessor Systems-on-Chip.
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Alexandre Yasuo Yamamoto and Cristinel Ababei
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- 2012
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7. Unified reliability estimation and management of NoC based chip multiprocessors.
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Alexandre Yasuo Yamamoto and Cristinel Ababei
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- 2014
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8. Health impact assessment of pet cats caused by organohalogen contaminants by serum metabolomics and thyroid hormone analysis
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Kei Nomiyama, Yasuo Yamamoto, Akifumi Eguchi, Hiroyuki Nishikawa, Hazuki Mizukawa, Nozomu Yokoyama, Osamu Ichii, Mitsuyoshi Takiguchi, Shouta M.M. Nakayama, Yoshinori Ikenaka, and Mayumi Ishizuka
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Thyroid Hormones ,Environmental Engineering ,Cats ,Halogenated Diphenyl Ethers ,Environmental Chemistry ,Animals ,Humans ,Metabolomics ,Environmental Pollutants ,Health Impact Assessment ,Pollution ,Waste Management and Disposal ,Polychlorinated Biphenyls - Abstract
Companion animals are in close contact with the human surroundings, and there is growing concern about the effects of harmful substances on the health of pet cats. In this study, we investigated the potential health effects of organohalogen compounds (OHCs) on thyroid hormone (TH) homeostasis and metabolomics in Japanese pet cats. There was a significant negative correlation between concentrations of several contaminants, such as polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), hydroxylated PCBs (OH-PCBs), hydroxylated PBDEs (OH-PBDEs), and THs in cat serum samples. These results suggested that exposure to OHCs causes a decrease in serum TH levels in pet cats. In this metabolomics study, each exposure level of parent compounds (PCBs and PBDEs) and their hydroxylated compounds (OH-PCBs and OH-PBDEs) were associated with their own unique primary metabolic pathways, suggesting that parent and phenolic compounds exhibit different mechanisms of action and biological effects. PCBs were associated with many metabolic pathways, including glutathione and purine metabolism, and the effects were replicated in in-vivo cat PCB administration studies. These results demonstrated that OHC exposure causes chronic oxidative stress in pet cats. PBDEs were positively associated with alanine, aspartate, and glutamate metabolism. Due to the chronic exposure of cats to mixtures of these contaminants, the combination of their respective metabolic pathways may have a synergistic effect.
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- 2022
9. Evaluation of Dielectric Loss in Randomly-Aligned Liquid Crystal Molecules for Millimeter-Wave Reflect Array Antenna
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Yosei Shibata, Yasuo Yamamoto, Takahiro Ishinabe, Hiroyasu Sato, Qiang Chen, and Hideo Fujikake
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General Medicine - Published
- 2022
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10. Search for in-band transitions in the candidate superdeformed band in 28Si
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R. G. T. Zegers, Johann Isaak, A. Bracco, B. Wasilewska, S. Zhu, T. H. Hoang, X. H. Zhou, J. J. Carroll, S. Adachi, C. Sullivan, M. P. Carpenter, M. Kumar Raju, Atsushi Tamii, L. Morris, Y. D. Fang, J. Schmitt, Shumpei Noji, N. Ichige, P. J. Davies, D. G. Jenkins, Eiji Ideguchi, G. Gey, Deniz Savran, Nobumichi Kobayashi, P. Adsley, S. Courtin, G. Fruet, Hooi Jin Ong, P. von Neumann-Cosel, A. S. Brown, Takeshi Koike, D. Montanari, A. Inoue, Nori Aoi, Hisanori Fujita, M.N. Harakeh, C. Iwamoto, V. Werner, Yasuo Yamamoto, M. L. Liu, M. Weinert, F. C. L. Crespi, Université de Strasbourg (UNISTRA), Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
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Physics ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,010308 nuclear & particles physics ,0103 physical sciences ,Astrophysics ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,010306 general physics ,01 natural sciences - Abstract
International audience; Background: Superdeformed (SD) bands are suggested by theory around Ca40 and in lighter alpha-conjugate nuclei such as Mg24, Si28, and S32. Such predictions originate from a number of theoretical models including mean-field models and antisymmetrized molecular dynamics (AMD) calculations. While SD bands have been identified in Ca40 and its near neighbors, evidence of their existence in the lighter, midshell nuclei is circumstantial at best. The key evidence of superdeformation would be the observation of transitions with high B(E2) transition strengths connecting states in a rotational sequence. This is challenging information to obtain since the bands lie at a high excitation energy and competition from out-of-band decay is dominant.Purpose: The purpose of the present study is to establish a new methodology to circumvent the difficulties in identifying and quantifying in-band transitions through directly populating candidate states in the SD band in Si28 through inelastic alpha scattering, selecting such states with a spectrometer, and measuring their gamma-ray decay with a large array of high-purity germanium detectors, allowing direct access to electromagnetic transition strengths.Methods: Excited states in Si28 were populated in the Si28(α,α′) reaction using a 130-MeV He4 beam from the K140 AVF cyclotron at the Research Center for Nuclear Physics. Outgoing alpha particles were analyzed using the Grand Raiden spectrometer positioned at an angle of 9.1∘ to favor the population of states with J≈4. Coincident gamma rays were detected with the CAGRA array of 12 HPGe clover detectors augmented by a set of four large LaBr3 detectors.Results: Data analysis showed that it was possible to identify additional low-energy transitions in competition with high-energy decays from excited states in Si28 in the vicinity of 10 MeV. However, while the candidate 4+ SD state at 10.944 MeV was populated, a 1148-keV transition to the candidate 2+ SD state at 9.796 MeV was not observed, and only an upper limit for its transition strength of B(E2)<43 W.u. could be established. This contradicts AMD predictions of ≈200 W.u. for such a transition.Conclusion: The present study strongly rejects the hypothesis that the candidate set of states identified in Si28 represents an SD band, which demonstrates the potential of the methodology devised here.
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- 2021
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11. Janus kinase inhibitor delgocitinib suppresses pruritus and nerve elongation in an atopic dermatitis murine model
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Kenji Usui, Tetsuya Honda, Mikio Hayashi, Yuji Hamada, Yasuo Yamamoto, Atsushi Otsuka, Noriko Konishi, Kenji Kabashima, Atsuo Tanimoto, Chisa Nakashima, Wataru Amano, Gyohei Egawa, Mutsuyoshi Matsushita, Yoshihiro Ishida, and Masashi Wada
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Male ,business.industry ,Pruritus ,Antipruritics ,Dermatology ,Atopic dermatitis ,Pharmacology ,Administration, Cutaneous ,medicine.disease ,Biochemistry ,Dermatitis, Atopic ,Disease Models, Animal ,Mice ,Murine model ,Animals ,Humans ,Janus Kinase Inhibitors ,Medicine ,Female ,Pyrroles ,business ,Skin pathology ,Molecular Biology ,Skin ,Janus kinase inhibitor - Published
- 2020
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12. JTP-117968, a novel selective glucocorticoid receptor modulator, exhibits significant anti-inflammatory effects while maintaining bone mineral density in mice
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Mutsuyoshi Matsushita, Takahisa Yamada, Yoshinori Kosugi, Takeshi Ohta, Takashi Nakagawa, Takahiro Hata, Takafumi Kurimoto, Katsuya Deai, Atsuko Miyai, Yasuo Yamamoto, and Isao Tamai
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0301 basic medicine ,Male ,Side effect ,Lipopolysaccharide ,Prednisolone ,Anti-Inflammatory Agents ,Arthritis ,Aminopyridines ,Pharmacology ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Glucocorticoid receptor ,Receptors, Glucocorticoid ,Bone Density ,medicine ,Fosdagrocorat ,Animals ,Humans ,Glucocorticoids ,JTP-117968 ,Transrepression ,Mice, Inbred BALB C ,Osteoblasts ,Glucocorticoid-induced osteoporosis ,business.industry ,Tumor Necrosis Factor-alpha ,PF-802 ,medicine.disease ,Arthritis, Experimental ,030104 developmental biology ,chemistry ,Collagen-induced arthritis model ,Mice, Inbred DBA ,Rheumatoid arthritis ,Intercellular Signaling Peptides and Proteins ,Selective glucocorticoid receptor modulator ,Female ,Joints ,Inflammation Mediators ,business ,030217 neurology & neurosurgery ,medicine.drug ,Phenanthrolines - Abstract
Classic glucocorticoids have been prescribed for various inflammatory diseases, such as rheumatoid arthritis, due to their outstanding anti-inflammatory effects. However, glucocorticoids cause numerous unwanted side effects, including osteoporosis and diabetes. Hence, selective glucocorticoid receptor modulators (SGRMs), which retain anti-inflammatory effects with minimized side effects, are among the most anticipated drugs in the clinical field. The assumption is that there are two major mechanisms of action via glucocorticoid receptors, transrepression (TR) and transactivation (TA). In general, anti-inflammatory effects of glucocorticoids are largely due to TR, while the side effects associated with glucocorticoids are mostly mediated through TA. We previously reported that JTP-117968, a novel SGRM, maintained partial TR activity while remarkably reducing the TA activity. In this study, we investigated the anti-inflammatory effect of JTP-117968 on a lipopolysaccharide (LPS) challenge model and collagen-induced arthritis (CIA) model in mice. Meanwhile, we tested the effect of JTP-117968 on the bone mineral density (BMD) in mouse femur to evaluate the side effect. Based on the evaluation, JTP-117968 reduced the plasma levels of tumor necrosis factor α induced by LPS challenge in mice significantly. Remarkably, CIA development was suppressed by JTP-117968 comparably with prednisolone and PF-802, an active form of fosdagrocorat that has been developed clinically as an orally available SGRM. Strikingly, the side effect of JTP-117968 on mouse femoral BMD was much lower than those of PF-802 and prednisolone. Therefore, JTP-117968 has attractive potential as a new therapeutic option against inflammatory diseases with minimized side effects compared to classic glucocorticoids.
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- 2021
13. Apalutamide‐induced exanthematous drug eruption displaying spongiotic dermatitis successfully treated with dose reduction
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Yoshio Kawakami, Hitoshi Takamoto, Yasuo Yamamoto, and Masao Mitsui
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medicine.medical_specialty ,Drug Tapering ,business.industry ,Apalutamide ,Eczema ,Dermatology ,medicine.disease ,Drug eruption ,chemistry.chemical_compound ,Thiohydantoins ,chemistry ,medicine ,Humans ,Dose reduction ,Drug Eruptions ,Spongiotic dermatitis ,business - Published
- 2021
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14. Extended-soft-core baryon-baryon model ESC16. III. S=−2 hyperon-hyperon/nucleon interactions
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M. M. Nagels, Yasuo Yamamoto, and Th. A. Rijken
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Physics ,Particle physics ,Meson ,010308 nuclear & particles physics ,Nuclear Theory ,Hyperon ,Parity (physics) ,Strangeness ,Lambda ,01 natural sciences ,Baryon ,0103 physical sciences ,Bound state ,Nuclear Experiment ,010306 general physics ,Nucleon - Abstract
Background: This is the third of a series of papers on baryon-baryon (BB) interactions, where the baryons are the lowest lying baryon states with spin and parity ${J}^{P}={(1/2)}^{+}$. The paper presents the extended-soft-core (ESC) model ESC16 for BB channels with strangeness $S=\ensuremath{-}2$.Purpose: The aim is to describe the ingredients of the $S=\ensuremath{-}2$ ESC16 potentials, to apply these two-body interactions to BB scattering and via $G$-matrix calculations to hypernuclear systems, and to compare with the presently available experimental information.Methods:The potentials for $S=\ensuremath{-}2$ are based on the SU(3) extension of the ESC potentials for the strangeness $S=0$ and $S=\ensuremath{-}1$ sectors, which are fitted to experimental nucleon-nucleon ($NN$), hyperon-nucleon ($YN$), and hyperon-hyperon ($YY$) data. Flavor SU(3) symmetry is broken only `kinematically' by the masses of the baryons and the mesons. For the $S=\ensuremath{-}2$ channels almost no experimental scattering data exist, and the information from hypernuclei is also rather limited. Nevertheless, in the fit to the $S=0$ and $S=\ensuremath{-}1$ sectors information from the Nagara event and the scarce experimental results on the $\mathrm{\ensuremath{\Xi}}N$ cross sections have been used as (mild) constraints to determine the free parameters in the simultaneous fit of the deuteron and the $NN\ensuremath{\bigoplus}YN$ scattering data. Therefore, the potentials for the $S=\ensuremath{-}2$ sectors are almost completely determined by the fits to the $NN, YN$ data, and SU(3) symmetry.Results: Various properties of the $S=\ensuremath{-}2$ potentials are illustrated by giving results for scattering lengths, bound states, phase parameters, and total cross sections. The well-depth ${U}_{\mathrm{\ensuremath{\Xi}}}$ is calculated and $\mathrm{\ensuremath{\Xi}}N G$-matrix interactions are derived and applied to ${\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}$-capture reactions. Here, a phenomenological $\mathrm{\ensuremath{\Xi}}N$ interaction is added to describe the experiments. Furthermore, the ESC16 model supplemented with phenomenological SU(3) symmetric gaussian interactions is analyzed, and attractive $\mathrm{\ensuremath{\Xi}}N$ interactions are obtained. Combined with three-body forces derived from the ESC meson-pair vertices and the Fujita-Miyazawa interaction, yields good baryon well depths.Conclusions: The ESC16 $S=\ensuremath{-}2$ potentials, with kinematically broken SU(3) symmetry, provide a basis for realistic calculations in nuclear and hypernuclear physics. For a successful description of the well depth's ${U}_{N},{U}_{\mathrm{\ensuremath{\Lambda}}},{U}_{\mathrm{\ensuremath{\Sigma}}}$, and ${U}_{\mathrm{\ensuremath{\Xi}}}$ and hypernuclear $S=\ensuremath{-}2$ reactions phenomenological additions are needed.
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- 2020
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15. Pituitary adenylate cyclase-activating polypeptide promotes cutaneous dendritic cell functions in contact hypersensitivity
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Yoshihiro Ishida, Judith A. Seidel, Akihiko Kitoh, Mikio Hayashi, Takashi Nomura, Kenji Kabashima, Mutsuyoshi Matsushita, Lai San Wong, Chisa Nakashima, Yasuo Yamamoto, Tetsuya Honda, Saeko Nakajima, Atsushi Otsuka, Noriko Konishi, Wataru Amano, Yumi Nonomura, and Teruki Dainichi
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0301 basic medicine ,Receptors, CCR7 ,Receptors, CXCR4 ,Immunology ,Neurotoxins ,TRPV Cation Channels ,C-C chemokine receptor type 7 ,Inflammation ,Mice, Transgenic ,Dermatitis, Contact ,03 medical and health sciences ,Chemokine receptor ,0302 clinical medicine ,Dorsal root ganglion ,Ganglia, Spinal ,medicine ,Immunology and Allergy ,Animals ,Dendritic cell migration ,Denervation ,Mice, Inbred BALB C ,integumentary system ,Chemistry ,Dendritic cell ,Cell biology ,030104 developmental biology ,medicine.anatomical_structure ,Langerhans Cells ,Pituitary Adenylate Cyclase-Activating Polypeptide ,Female ,Lymph Nodes ,medicine.symptom ,Diterpenes ,Haptens ,030217 neurology & neurosurgery ,Sensory nerve - Abstract
Background Sensory nerves regulate cutaneous local inflammation indirectly through induction of pruritus and directly by acting on local immune cells. The underlying mechanisms for how sensory nerves influence cutaneous acquired immune responses remain to be clarified. Objective This study aimed to explore the effect of peripheral nerves on cutaneous immune cells in cutaneous acquired immune responses. Methods We analyzed contact hypersensitivity (CHS) responses as a murine model of delayed-type hypersensitivity in absence or presence of resiniferatoxin-induced sensory nerve denervation. We conducted ear thickness measurements, flow cytometric analyses, and mRNA expression analyses in CHS. Results CHS responses were attenuated in mice that were denervated during the sensitization phase of CHS. By screening neuropeptides, we found that pituitary adenylate cyclase-activating polypeptide (PACAP) mRNA expression was decreased in the dorsal root ganglia after denervation. Administration of PACAP restored attenuated CHS response in resiniferatoxin-treated mice, and pharmacological inhibition of PACAP suppressed CHS. Flow cytometric analysis of skin-draining lymph nodes showed that cutaneous dendritic cell migration and maturation were reduced in both denervated mice and PACAP antagonist-treated mice. The expression of chemokine receptors CCR7 and CXCR4 of dendritic cell s was enhanced by addition of PACAP in vitro. Conclusion These findings indicate that a neuropeptide PACAP promotes the development of CHS responses by inducing cutaneous dendritic cell functions during the sensitization phase.
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- 2020
16. Possible Lightest Ξ Hypernucleus with Modern ΞN Interactions
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T. Doi, T. Hatsuda, Yasuo Yamamoto, Th. A. Rijken, Emiko Hiyama, Kenji Sasaki, and Takaya Miyamoto
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Quantum chromodynamics ,Physics ,Particle physics ,Gaussian ,Binding energy ,General Physics and Astronomy ,State (functional analysis) ,Quantum number ,Hypernucleus ,01 natural sciences ,symbols.namesake ,Isospin ,0103 physical sciences ,symbols ,010306 general physics ,Spin-½ - Abstract
Experimental evidence exists that the Ξ-nucleus interaction is attractive. We search for NNΞ and NNNΞ bound systems on the basis of the AV8 NN potential combined with either a phenomenological Nijmegen ΞN potential or a first principles HAL QCD ΞN potential. The binding energies of the three-body and four-body systems (below the d+Ξ and ^{3}H/^{3}He+Ξ thresholds, respectively) are calculated by a high precision variational approach, the Gaussian expansion method. Although the two ΞN potentials have significantly different isospin (T) and spin (S) dependence, the NNNΞ system with quantum numbers (T=0, J^{π}=1^{+}) appears to be bound (one deep for Nijmegen and one shallow for HAL QCD) below the ^{3}H/^{3}He+Ξ threshold. Experimental implications for such a state are discussed.
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- 2020
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17. Determination of free thyroid hormones in animal serum/plasma using ultrafiltration in combination with ultra-fast liquid chromatography-tandem mass spectrometry
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Kohki Takaguchi, Yasuo Yamamoto, Shinsuke Tanabe, Kei Nomiyama, Imari Kume, Rumi Tanoue, and Tatsuya Kunisue
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Serum ,Thyroid Hormones ,Ultrafiltration ,010501 environmental sciences ,Mass spectrometry ,01 natural sciences ,Biochemistry ,Analytical Chemistry ,chemistry.chemical_compound ,Dogs ,Tandem Mass Spectrometry ,Liquid chromatography–mass spectrometry ,Animals ,Humans ,Ultra fast ,Bovine serum albumin ,0105 earth and related environmental sciences ,Immunoassay ,Chromatography ,biology ,010401 analytical chemistry ,Organic Chemistry ,Serum plasma ,Reproducibility of Results ,General Medicine ,0104 chemical sciences ,chemistry ,Thyroid hormones ,Thyronine ,Cats ,biology.protein ,Cattle ,Blood Chemical Analysis ,Chromatography, Liquid - Abstract
Thyroid hormones (THs), which mainly consist of 3, 3', 5-triiodo-l-thyronine (T3) and L-thyroxine (T4), play a critical role in regulating biological processes such as growth and metabolism in various animal species. Thus, accurate measurement of T3 and T4, especially physiologically active free (protein-unbound) forms, in serum/plasma is needed for the evaluation of TH homeostasis. However, such high-precision determination of free THs is lacking for non-human species. The present study aimed to develop a highly sensitive and reliable liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the determination of six free THs in serum/plasma, which is applicable to not only humans but also non-human species. Two different physical separation steps, ultrafiltration (UF) and equilibrium dialysis (ED), were examined to obtain the free TH fraction. Several experimental conditions were carefully optimized and validated for UF or ED using the commercially available bovine serum. As a result, UF at 1100 × g and 37 °C for 30 min with a 30 kDa ultrafiltration device (Centrifree YM-30, Millipore) yielded excellent precision (CV:10%). The optimized ED step also yielded high precision (CV:10%) and the measurement values were approximately equal to those of UF, but at least 16 h were required to reach equilibrium. Thus, UF combined with LC-MS/MS was finally chosen, in terms of the time needed for the measurement. Acceptable accuracy (recovery: 70%-110%) and intra- and inter-day precision (CV:10% and12%, respectively) were obtained, when triplicate analyses in three different days were conducted using the bovine serum. The developed analytical method was successfully applied to the determination of free THs in serum/plasma samples of humans, cats, and dogs. Furthermore, comparison with free T4 concentrations measured by a common immunoassay method evidently indicated that the ultrafiltration-LC-MS/MS method developed in this study can increase the specificity and accuracy of TH measurement.
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- 2018
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18. J-PARC hadron experimental facility extension project *
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Fuminori Sakuma, Kazuya Aoki, Hiroyuki Fujioka, Toshiyuki Gogami, Yoshimasa Hidaka, Emiko Hiyama, Ryotaro Honda, Atsushi Hosaka, Yudai Ichikawa, Masaharu Ieiri, Masahiro Isaka, Noriyoshi Ishii, Takatsugu Ishikawa, Yusuke Komatsu, Takeshi Komatsubara, GeiYoub Lim, Koji Miwa, Yuhei Morino, Tomofumi Nagae, Sho Nagao, Satoshi N. Nakamura, Hajime Nanjo, Megumi Naruki, Hidekatsu Nemura, Tadashi Nomura, Hiroyuki Noumi, Hiroaki Ohnishi, Kyoichiro Ozawa, Shinya Sawada, Takayasu Sekihara, Sang-In Shim, Koji Shiomi, Kotaro Shirotori, Yasuhisa Tajima, Hitoshi Takahashi, Toshiyuki Takahashi, Sachiko Takeuchi, Makoto Takizawa, Hirokazu Tamura, Kiyoshi Tanida, Mifuyu Ukai, Takeshi O. Yamamoto, and Yasuo Yamamoto
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The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.
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- 2022
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19. Low-lying level structure of Λ hypernuclei and spin dependence of the ΛN interaction with antisymmetrized molecular dynamics
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Yasuo Yamamoto, Masahiro Isaka, and Toshio Motoba
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Physics ,010308 nuclear & particles physics ,Nuclear Theory ,Interaction model ,Lambda ,01 natural sciences ,Molecular dynamics ,Excited state ,0103 physical sciences ,Level structure ,Condensed Matter::Strongly Correlated Electrons ,Atomic physics ,010306 general physics ,Energy (signal processing) ,Excitation ,Spin-½ - Abstract
$\Lambda N$ spin-spin and spin-orbit splittings in low-lying excitation spectra are investigated for $p$-shell $\Lambda$ hypernuclei on the basis of the microscopic structure calculation within the antisymmetrized molecular dynamics, where the $\Lambda N$ $G$-matrix interaction derived from the baryon-baryon interaction model ESC (extended soft core) is used. It is found that the ground-state spin-parity is systematically reproduced in the $p$-shell $\Lambda$ hypernuclei by tuning the $\Lambda N$ spin-spin and spin-orbit interactions so as to reproduce the experimental data of $^{4}_\Lambda$H, $^{7}_\Lambda$Li and $^9_\Lambda$Be. Furthermore, we also focus on the excitation energies of the excited doublets as well as the energy shifts of them by the addition of a $\Lambda$ particle.
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- 2020
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20. Wave Propagation Direction and c -Axis Tilt Angle Influence on the Performance of ScAlN/Sapphire-Based SAW Devices
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Shuji Tanaka, Akihiko Teshigahara, Yasuo Yamamoto, Ken-ya Hashimoto, Masayoshi Esashi, and Abhay Kochhar
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010302 applied physics ,Materials science ,Acoustics and Ultrasonics ,business.industry ,Wave propagation ,Surface acoustic wave ,Sound power ,01 natural sciences ,Piezoelectricity ,symbols.namesake ,Optics ,Tilt (optics) ,0103 physical sciences ,Return loss ,symbols ,Insertion loss ,Electrical and Electronic Engineering ,Rayleigh scattering ,business ,010301 acoustics ,Instrumentation - Abstract
Some previously reported surface acoustic wave (SAW) devices using bulk piezoelectric substrates showed higher acoustic power radiated in either forward or backward wave propagation direction depending on their crystal orientations and are called natural single-phase unidirectional transducers (NSPUDT). While these reports were based on bulk piezoelectric substrates, we report directionality in the c-axis tilted 44% scandium doped aluminum nitride thin piezoelectric film-based SAW devices on sapphire. It is worth noting that our observance of directionality is specifically in Sezawa mode. We produced a c-axis tilt up to 5.5° over the single wafer and examined the directionality by comparing the forward and backward insertion loss utilizing split finger electrodes as a receiver. The wave propagation direction and c-axis tilt angle influence on the performance of SAW devices is evaluated. Furthermore, return loss and insertion loss data are presented for various SAW propagation directions and c-axis tilt angles. Finally, the comparison for both acoustic modes, i.e., Rayleigh and Sezawa, is reported.
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- 2016
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21. TRPA1 channel participates in tacrolimus-induced pruritus in a chronic contact hypersensitivity murine model
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Naomi Kitayama, Chisa Nakashima, Lai San Wong, Kenji Kabashima, Yumi Nonomura, Atsushi Otsuka, Yasuo Yamamoto, Kenji Usui, and Tetsuya Honda
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Male ,0301 basic medicine ,medicine.medical_specialty ,Calcineurin Inhibitors ,Mice, Transgenic ,Substance P ,Dermatology ,Filaggrin Proteins ,Administration, Cutaneous ,Dermatitis, Contact ,Biochemistry ,Tacrolimus ,Ointments ,Oxazolone ,Mice ,030207 dermatology & venereal diseases ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Intermediate Filament Proteins ,Ganglia, Spinal ,Oximes ,Animals ,Humans ,Medicine ,TRPA1 Cation Channel ,Molecular Biology ,Skin ,Mice, Inbred BALB C ,Behavior, Animal ,business.industry ,Pruritus ,Contact hypersensitivity ,Atopic dermatitis ,medicine.disease ,Calcineurin ,Disease Models, Animal ,030104 developmental biology ,chemistry ,Immunology ,business ,Contact dermatitis ,Aprepitant - Published
- 2018
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22. Extended-soft-core baryon-baryon model ESC16. II. Hyperon-nucleon interactions
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M. M. Nagels, Th. A. Rijken, and Yasuo Yamamoto
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Quark ,Physics ,Particle physics ,010308 nuclear & particles physics ,Physics::Medical Physics ,High Energy Physics::Phenomenology ,Nuclear Theory ,Hyperon ,Form factor (quantum field theory) ,Constituent quark ,Lambda ,01 natural sciences ,Baryon ,Pomeron ,Theoretical High Energy Physics ,0103 physical sciences ,High Energy Physics ,Nuclear Experiment ,010306 general physics ,Nucleon ,GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries) - Abstract
This hyperon-nucleon paper is part of a simultaneous treatment of all baryon-baryon systems: $N\phantom{\rule{0}{0ex}}N$, $Y\phantom{\rule{0}{0ex}}N$, and $Y\phantom{\rule{0}{0ex}}Y$. Utilizing a meson-exchange potential approach, all $8\ifmmode\times\else\texttimes\fi{}8$ baryon-baryon channels are described in a model with SU(3)-symmetric couplings consistent with the constituent quark model. A high-quality fit is achieved for the $N\phantom{\rule{0}{0ex}}N$ data (${T}_{\text{Lab}}l350$ MeV) and the available $p$-$\mathrm{\ensuremath{\Lambda}}$ and $p$-$\mathrm{\ensuremath{\Sigma}}$ data.
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- 2019
23. Extended-soft-core baryon-baryon model ESC16. I. Nucleon-nucleon scattering
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M. M. Nagels, Yasuo Yamamoto, and Th. A. Rijken
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Physics ,Coupling constant ,Particle physics ,Meson ,High Energy Physics::Phenomenology ,Nuclear Theory ,Scalar (mathematics) ,Form factor (quantum field theory) ,Baryon ,Pseudoscalar ,Theoretical High Energy Physics ,Nuclear force ,High Energy Physics ,Nuclear Experiment ,Nucleon - Abstract
The Nijmegen extended-soft-core ESC08c model for the baryon-baryon (BB) interactions of the SU(3) flavor-octet of baryons (N, �, �, and �) is presented. In this first of a series of papers, the NN results are reported in detail. In the spirit of the Yukawa-approach to the nuclear force problem, the interactions are studied from the meson-exchange picture viewpoint, using generalized soft-core Yukawa-functions. These interactions are supplemented with (i) multiple-gluonexchange, and (ii) structural effects due to the quark-core of the baryons. The extended-soft-core (ESC) meson-exchange interactions consist of local- and non-local-potentials due to (i) One-bosonexchanges (OBE), which are the members of nonets of pseudoscalar, vector, scalar, and axial-vector mesons, (ii) diffractive (i.e. multiple-gluon) exchanges, (iii) two pseudo-scalar exchange (PS-PS), and (iv) meson-pair-exchange (MPE). The OBE- and MPE-vertices are regulated by gaussian form factors producing potentials with a soft behavior near the origin. The assignment of the cut-off masses for the BBM-vertices is dependent on the SU(3)-classification of the exchanged mesons for OBE, and a similar scheme for MPE. The ESC-models ESC08, as well as its predecessor ESC04, describe the nucleon-nucleon (NN), hyperon-nucleon (YN), and hyperon-hyperon (YY) interactions in a unified way using broken SU(3)symmetry. Important non-standard ingredients in the OBE-sector in the ESC-models are (i) the axial-vector meson potentials, and (ii) a zero in the scalar- and axial-vector meson form factors. These innovations make it possible to keep the meson coupling parameters of the model qualitatively in accordance with the predictions of the 3 P0-dominated quark-antiquark pair creation (QPC) model. SU(3)-symmetry serves to connect the NN with the Y N and the Y Y channels. In the fit to NN and YN many parameters are essentially fixed by the NN-data. A few, but severely constrained e.g. F/(F + D)-ratio’s, parameters are left for determination of the Y N-interactions and the Y Y experimental indications. In particular, the meson-baryon coupling constants are calculated via SU(3) using the coupling constants of the NN ⊕Y N-analysis as input. In ESC08 the couplings are kept SU(3)-symmetric. In establishing the parameters of the model a simultaneous fit to NN- and YN-channels has been performed. Here the information about ��, �N, and hypernuclei played an important role in the form of using constraints. In particular, the experimental indications for the ��-attraction, the �-nuclear and the �-nuclear well-depth were directive. About 25 physical coupling parameters and 8 cut-off and diffractive masses, were searched. The obtained OBE-couplings and the F/(F + D)ratio’s can be well understood in the context of the QPC-model. The simultaneous fit of the ESC-models to the NN- and YN- scattering data with a single set of parameters has achieved excellent results for the NN- and YN-data, and for the YY-data in
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- 2019
24. Extended-soft-core baryon-baryon model ESC16
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M. M. Nagels, Yasuo Yamamoto, and Th. A. Rijken
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Physics ,Baryon ,Particle physics ,Deuterium ,Scattering ,Bound state ,Binding energy ,Context (language use) ,Coupling (probability) ,Symmetry (physics) - Abstract
The most recent Nijmegen extended-soft-core ESC16 model for the baryon-baryon (BB) interactions of the SU(3) flavor-octet of baryons (N, Λ, Σ, and Ξ) is presented. The ESC model ESC16, as well as its predecessors ESC08 and ESC04, describe the nucleon-nucleon (NN), hyperon-nucleon (YN), and hyperon-hyperon (YY) interactions in a unified way using broken SU(3) symmetry. In this paper we outline the differences between ESC16 and ESC08c.The parameters of the ESC models are established in a simultaneous fit to the NN and YN data, taking into account information about ΛΛ, ΞN, and Λ-hypernuclei in the form of constraints. In particular, the experimental indications for ΛΛ-attraction, Ξ-nuclear and Σ-nuclear well-depth were taken into account as much as possible. About 25 physical coupling parameters and 8 cut-off and diffractive masses, were searched. The obtained OBE-couplings and the F/(F+D) ratios can be well understood in the context of the quark-antiquark pair creation (QPC) mechanism.The fit of the ESC-models to the NN- and YN- scattering data with a single set of parameters has achieved excellent results for the NN and YN data, and for the YY data in accordance with the experimental indications for ΛΛ. In the case of the most recent ESC model, called ESC16, the achievements are: (i) For the selected 4313 pp and np scattering data with energies 0 ≤ Tlab ≤ 350 MeV, the model reaches a fit having χ2/Ndata = 1.10. (ii) The deuteron binding energy and all of the NN scattering lengths are fitted very nicely. (iii) The YN data are described very well with χ2 /Ndata = 1.11, giving at the same time good descriptions of the Λ, Σ, and Ξ nuclear well-depths. (iv) The model has no bound states for S = −1,−2,−3,−4. (v) The nuclear saturation, and well-depths UΣ, UΞ require important contributions from three-body forces.The most recent Nijmegen extended-soft-core ESC16 model for the baryon-baryon (BB) interactions of the SU(3) flavor-octet of baryons (N, Λ, Σ, and Ξ) is presented. The ESC model ESC16, as well as its predecessors ESC08 and ESC04, describe the nucleon-nucleon (NN), hyperon-nucleon (YN), and hyperon-hyperon (YY) interactions in a unified way using broken SU(3) symmetry. In this paper we outline the differences between ESC16 and ESC08c.The parameters of the ESC models are established in a simultaneous fit to the NN and YN data, taking into account information about ΛΛ, ΞN, and Λ-hypernuclei in the form of constraints. In particular, the experimental indications for ΛΛ-attraction, Ξ-nuclear and Σ-nuclear well-depth were taken into account as much as possible. About 25 physical coupling parameters and 8 cut-off and diffractive masses, were searched. The obtained OBE-couplings and the F/(F+D) ratios can be well understood in the context of the quark-antiquark pair creation (QPC) mechanism.The fit of the ESC-mod...
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- 2019
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25. Collinear and degenerate polariton pair emission via biexciton‐resonant hyper‐parametric scattering
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Hayate Shimizu, Goro Oohata, Kohji Mizoguchi, and Yasuo Yamamoto
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Physics ,Condensed matter physics ,Scattering ,Degenerate energy levels ,Polariton ,Atomic physics ,Condensed Matter Physics ,Biexciton ,Parametric statistics - Published
- 2015
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26. Effects of repulsive three-body force in 12C + 12C scattering at 100A MeV
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R. Wada, X. Y. Le, Bao-Hua Sun, Yukinori Sakuragi, Takenori Furumoto, Harutaka Sakaguchi, Yassid Ayyad, Hooi Jin Ong, Isao Tanihata, A. Inoue, Atsushi Tamii, Taofeng Wang, Chen Zhen, S. Terashima, Dan-Yang Pang, Gao-Long Zhang, Yasuo Yamamoto, W.W. Qu, and C.L. Guo
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Elastic scattering ,Physics ,Nuclear and High Energy Physics ,Scattering ,Nuclear Theory ,Complex G-matrix interaction ,Inelastic scattering ,Three-body force ,lcsh:QC1-999 ,Nuclear physics ,Cross section (physics) ,Excited state ,三体力 ,Atomic physics ,Ground state ,Nuclear Experiment ,Angular distribution ,Excitation ,lcsh:Physics - Abstract
The angular distribution of 12 C + 12 C scattering at an incident energy of 100 A MeV has been measured. The elastic and inelastic scatterings in 12 C to the excitation energies of up to ∼ 45 MeV were measured simultaneously for the first time with the high-resolution Grand Raiden spectrometer at the Research Center for Nuclear Physics (RCNP). The angular distributions of the elastic scattering to the ground state ( 0 1 + ) and inelastic scattering to the 4.44 MeV ( 2 1 + ) excited state were precisely obtained in the angular range of 1.0°–7.5° with a step of 0.1°. Additionally, the angular distribution was obtained for the sum of the cross sections for excitation energies above the 4.44 MeV state up to 11 MeV, which includes the 7.65 MeV ( 0 2 + ), 9.64 MeV ( 3 1 − ), and 10.30 MeV ( 2 2 + ) states, in addition to probably the simultaneous excitation of the 4.44 MeV state in the projectile and the target nuclei. Those combined data provide a means to study the effects of channel coupling on the elastic cross section. The observed angular distributions are compared with theoretical calculations based on three double-folding models with complex G-matrix interactions, the CEG07b, MPa, and ESC models. The importance of three-body repulsive forces included in the CEG07b and MPa models will be discussed.
- Published
- 2015
27. Transient elevation of cytoplasmic calcium ion concentration at a single cell level precedes morphological changes of epidermal keratinocytes during cornification
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Fumiko Toyoshima, Gyohei Egawa, Yasuo Yamamoto, Tetsuya Honda, Teruasa Murata, Teruki Dainichi, Ryo Ichijo, and Kenji Kabashima
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0301 basic medicine ,Keratinocytes ,Programmed cell death ,Cytoplasm ,Cellular differentiation ,lcsh:Medicine ,Fluorescent Antibody Technique ,Gene Expression ,Granular layer ,Article ,Ion ,03 medical and health sciences ,Basal (phylogenetics) ,Mice ,Single-cell analysis ,Genes, Reporter ,Gene expression ,Animals ,lcsh:Science ,Cell Shape ,Cells, Cultured ,Calcium metabolism ,Ions ,Multidisciplinary ,integumentary system ,Chemistry ,lcsh:R ,Cell Differentiation ,Cell biology ,030104 developmental biology ,Epidermal Cells ,lcsh:Q ,Calcium ,Single-Cell Analysis - Abstract
Epidermal keratinocytes achieve sequential differentiation from basal to granular layers, and undergo a specific programmed cell death, cornification, to form an indispensable barrier of the body. Although elevation of the cytoplasmic calcium ion concentration ([Ca2+]i) is one of the factors predicted to regulate cornification, the dynamics of [Ca2+]i in epidermal keratinocytes is largely unknown. Here using intravital imaging, we captured the dynamics of [Ca2+]i in mouse skin. [Ca2+]i was elevated in basal cells on the second time scale in three spatiotemporally distinct patterns. The transient elevation of [Ca2+]i also occurred at the most apical granular layer at a single cell level, and lasted for approximately 40 min. The transient elevation of [Ca2+]i at the granular layer was followed by cornification, which was completed within 10 min. This study demonstrates the tightly regulated elevation of [Ca2+]i preceding the cornification of epidermal keratinocytes, providing possible clues to the mechanisms of cornification.
- Published
- 2018
28. Gamma decay of pygmy states in $^{90,94}$Zr from inelastic scattering of light ions
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D. Montanari, L. Morris, Y. D. Fang, M. Spieker, Takeshi Koike, Johann Isaak, P. J. Davies, B. Wasilewska, T. Klaus, Deniz Savran, Shumpei Noji, C. Sullivan, G. Gey, O. Wieland, M. Kumar Raju, J. J. Carroll, G. Steinhilber, S. Zhu, T. H. Hoang, A. Czeszumska, X. K. Zhou, A. Inoue, S. G. Pickstone, N. Ichige, D. G. Jenkins, A. S. Brown, Atsushi Tamii, Nobumichi Kobayashi, Tetsuya Yamamoto, Nori Aoi, N. Blasi, F. Camera, A. Bracco, V. Werner, A. Maj, M. L. Liu, O. H. Jin, Eiji Ideguchi, M. P. Carpenter, C. Iwamoto, Yasuo Yamamoto, H. Fujita, S. Bassauer, M. Krzysiek, M. Ciemala, F. C. L. Crespi, L. M. Donaldson, D. L. Balabanski, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
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Physics ,History ,Scintillation ,Spectrometer ,010308 nuclear & particles physics ,Gamma ray ,Inelastic scattering ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,Resonance (particle physics) ,Computer Science Applications ,Education ,Ion ,Nuclear physics ,Dipole ,0103 physical sciences ,ddc:530 ,010306 general physics ,Hpge detector ,Nuclear Experiment - Abstract
International audience; We performed experiments to study the low-energy part of the E1 response (Pygmy Dipole Resonance) in $^{90,94}$Zr nuclei, by measuring the (p,p’γ) and (α,α’γ) inelastic scattering reactions at energies Ebeam,p = 80 MeV and Ebeam,α = 130 MeV respectively. The inelastically scattered particles were measured by employing the high-resolution spectrometer Grand Raiden. The gamma-rays emitted following the de-excitation of the Zr target nuclei were detected using both the clover type HPGe detectors of the CAGRA array and the large volume LaBr3:Ce scintillation detectors from the HECTOR+ array. Some preliminary results are presented here.
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- 2017
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29. Baryon–Baryon {8}\( \otimes \){8}-Channels Interactions
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Th. A. Rijken, M. M. Nagels, and Yasuo Yamamoto
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Physics ,Coupling constant ,Particle physics ,Meson ,High Energy Physics::Phenomenology ,Nuclear Theory ,Scalar (mathematics) ,Binding energy ,Zero (complex analysis) ,Symmetry (physics) ,Baryon ,Pomeron ,High Energy Physics::Experiment ,Nuclear Experiment - Abstract
The extended-soft-core model ESC08 is presented. The ESC-models are at present the most complete meson-exchange models for the baryon–baryon interactions. The ESC-model describes the nucleon–nucleon (NN), hyperon–nucleon (YN), and hyperon–hyperon (YY), in terms of meson-exchanges using (broken) SU(3)f-symmetry. In this approach to baryon-baryon (BB) the dynamics is derived from (i) one-boson-exchanges (OBE), (ii) two-meson-exchanges (TME), and (iii) meson-pair-exchanges (MPE), (iv) gluon-exchanges in the form of the pomeron and odderon potentials, and (v) quark-core effects. In the OBE-sector, special features are: (a) the inclusion of a zero in the scalar- and axial- meson form-factors, (b) the odderon-exchage representing the exchange of the odd-number gluons-exchange, whereas the pomeron represents the even-number gluon-exchange, and (c) special pronounced effects of the appearance of forbidden six-quark configurations. With these ingredients a rather flexible dynamical framework is constructed. Namely, it appeared feasible to keep the parameters of the model in reasonable accordance with the predictions of the ^3P_0 quark-pair-creation model (QPC), although in ESC08a,b,c an admixture of ^3S_1 quark-pair creation is present. This is the case for the meson- and meson-pair-baryon coupling constants and the F/(F+D)-ratio’s as well. The NN, YN, and YY results for this model are excellent. This is marked in particularly by the NN-results, namely \(\chi _{p.d.p.}^{2} = 1.08\) for ESC08a,b,c. Also, we improved the ΛN spin–orbit interaction greatly by the inclusion of (a) the Brown, Downs, and Iddings anti-symmetric spin–orbit potentials, and (b) new corrections to the MPE-potentials. Also, the special quark-core effects provide extra repulsion in the Σ^+p(^3S_1, T = 3/2)- and ΣN(^1S_0, T = 1/2)-channels, although the strength is constrained by SU(3) symmetry and the Σ^+p experimental X-sections. In the S = −2 sector the ΛΛ-interaction is weak, which is in accordance with the NAGARA-event. Furthermore, in the ΞN(^3S_1, I = 1) there occurs a “strange-deuteron” D^* with binding-energy \(E_{B}^{*} \approx 2.0 - 1.5\) MeV. A very notable consequence of the MPE-vertices are the related three-body forces (TBF). In this conference we report on the predictions of these TBF’s for (i) the triton binding energy, and (ii) the charge-symmetry-breaking (CSB) effects. The first results are encouraging.
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- 2017
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30. Variational Approach to Neutron Star Matter with Hyperons
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Yasuo Yamamoto, Emiko Hiyama, Masatoshi Takano, and Hajime Togashi
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Physics ,Particle physics ,Neutron star ,Hyperon - Published
- 2017
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31. Experimental study of the acoustoelastic effect on the sensitivity of surface acoustic wave sensors
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Yasuo Yamamoto, Toshihiko Takahata, Akihiko Teshigahara, and Han Tei
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010302 applied physics ,Materials science ,Acoustics ,Surface acoustic wave ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Carbide ,Stress (mechanics) ,Distortion ,0103 physical sciences ,Perpendicular ,Electronic engineering ,Acoustoelastic effect ,Surface acoustic wave sensor ,Sensitivity (control systems) ,0210 nano-technology - Abstract
This paper reports, for the first time, the sensitivity deterioration phenomenon of surface acoustic wave (SAW) sensors for distortion, load, or pressure monitoring. Assuming that the acoustoelastic effect causes this phenomenon and that the effect can be characterized with two coefficients for stress components parallel and perpendicular to SAW propagation direction, we developed a method to quantify these coefficients. We found that the coefficient for the stress parallel to the propagation direction causes sensitivity deterioration for Sc doped AlN (ScAlN) film on 6H-silicon carbide (6H-SiC) substrate structures. This result also indicates the possibility of effectively improving the sensitivity by taking advantage of the effect.
- Published
- 2017
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32. Repulsive three-body force and channel-coupling effects via C12+C12 scattering at 100A MeV
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G. L. Zhang, A. Inoue, Yukinori Sakuragi, Chen Zhen, Satoru Terashima, Taofeng Wang, Isao Tanihata, Bao-Hua Sun, Hooi Jin Ong, Dan-Yang Pang, Takenori Furumoto, Yasuo Yamamoto, C.L. Guo, X. Y. Le, W.W. Qu, Harutaka Sakaguchi, R. Wada, Yassid Ayyad, and Atsushi Tamii
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Physics ,Elastic scattering ,010308 nuclear & particles physics ,Scattering ,Inelastic scattering ,01 natural sciences ,Three-body force ,Excited state ,0103 physical sciences ,Sensitivity (control systems) ,Atomic physics ,010306 general physics ,Ground state ,Energy (signal processing) - Abstract
The angular distributions of differential cross sections of $^{12}\mathrm{C}+^{12}\mathrm{C}$ elastic and inelastic scattering populating the ground and excited states in $^{12}\mathrm{C}$ up to 15 MeV excitation energy are precisely measured for the first time at an incident energy of $100A$ MeV to study the effect of repulsive three-body forces. Using the high-resolution spectrometer Grand Raiden at the Research Center for Nuclear Physics (RCNP), Osaka University, we have obtained the differential cross sections for the ground state (${0}_{1}^{+}$) and 4.44 MeV (${2}_{1}^{+}$) excited state, as well as the summed differential cross sections for the states between 4.44 and 15 MeV in the angular range of $1.{0}^{\ensuremath{\circ}}--7.{5}^{\ensuremath{\circ}}$. The results are compared with microscopic coupled-channel calculations. The potential between the colliding nuclei is determined by the double folding method with three different complex $G$-matrix interactions, the ESC, CEG07b, and MPa interactions. The CEG07b and MPa interactions, which include repulsive three-body forces, describe the data well, whereas the ESC interaction, which does not include repulsive three-body forces, fails to reproduce the data. The results provide evidence of repulsive three-body forces in $^{12}\mathrm{C}$ and demonstrate the possible sensitivity of elastic scattering to three-body forces.
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- 2017
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33. A novel JAK inhibitor JTE-052 reduces skin inflammation and ameliorates chronic dermatitis in rodent models: Comparison with conventional therapeutic agents
- Author
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Eriko Taniai-Riya, Mikio Hayashi, Yasuo Yamamoto, Yuichi Shinozaki, Atsuo Tanimoto, Kochi Kakimoto, Wataru Amano, Yoshiaki Katsuda, Yukari Kimoto, Kaoru Toyoda, and Noriko Konishi
- Subjects
0301 basic medicine ,Male ,Thymic stromal lymphopoietin ,Inflammation ,Dermatology ,Immunoglobulin E ,Biochemistry ,Interleukin-23 ,Proinflammatory cytokine ,Dermatitis, Atopic ,030207 dermatology & venereal diseases ,03 medical and health sciences ,Mice ,0302 clinical medicine ,Thymic Stromal Lymphopoietin ,Psoriasis ,Rats, Inbred BN ,medicine ,Animals ,Humans ,Janus Kinase Inhibitors ,Pyrroles ,Molecular Biology ,Skin ,Mice, Inbred BALB C ,biology ,business.industry ,Atopic dermatitis ,Ciclosporin ,medicine.disease ,Tacrolimus ,Rats ,Mice, Inbred C57BL ,030104 developmental biology ,Methotrexate ,Immunology ,biology.protein ,Cyclosporine ,Interleukin-23 Subunit p19 ,Cytokines ,Female ,medicine.symptom ,business ,Haptens ,medicine.drug - Abstract
Janus kinases (JAKs) are required for several inflammatory cytokine signalling pathways and are implicated in the pathogenesis of chronic dermatitis, including atopic dermatitis and psoriasis. JAK inhibitors are therefore promising therapeutic candidates for chronic dermatitis. In this study, we evaluated the effects of the novel JAK inhibitor JTE-052 on inflammatory responses associated with chronic dermatitis, and compared its profile with those of conventional therapeutic agents in rodent models of chronic dermatitis. JTE-052 inhibited the Th1-, Th2- and Th17-type inflammatory responses of human T cells and mast cells in vitro. Oral administration of JTE-052 inhibited skin inflammation in hapten-induced chronic dermatitis in mice, associated with reduced levels of inflammatory cytokines in the skin and immunoglobulin (Ig) E in serum. In contrast, although ciclosporin partly inhibited skin inflammation, it did not reduce interleukin (IL)-4 production in skin, and enhanced IgE production in serum. Oral administration of JTE-052 also inhibited skin inflammation in mouse models of atopic dermatitis and psoriasis induced by a mite extract, thymic stromal lymphopoietin or IL-23. The maximal efficacy of JTE-052 in these dermatitis models was superior to the conventional therapeutic agents, ciclosporin and methotrexate. Topical application of JTE-052 ointment ameliorated hapten-induced chronic dermatitis in rats more effectively than tacrolimus ointment. Furthermore, JTE-052 ointment did not cause the thinning of normal skin associated with topical corticosteroids. These results indicate that JTE-052 is a promising candidate as an anti-inflammatory drug for various types of chronic dermatitis, with a distinctly different profile from conventional therapy following either oral or topical application.
- Published
- 2017
34. Evaluation of two-photon polarization density matrix of polarization-entangled photon pairs generated through biexciton resonant hyper-parametric scattering
- Author
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Kohji Mizoguchi, Yasuo Yamamoto, and Goro Oohata
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Density matrix ,Physics ,Quantum Physics ,Photon ,Scattering ,FOS: Physical sciences ,Statistical and Nonlinear Physics ,Polarization (waves) ,Molecular physics ,Atomic and Molecular Physics, and Optics ,Polarization density ,Photon polarization ,Quantum Physics (quant-ph) ,Biexciton ,Excitation - Abstract
We have investigated the excitation-power dependence of polarization-entangled photon pairs generated from a CuCl single crystal using biexciton resonant hyper-parametric scattering. The two-photon polarization density matrix of photon pairs generated from a CuCl single crystal maintained at 10 K was measured under different excitation powers. The measured two-photon polarization density matrix, which corresponds to the two-photon polarization state, changes with an increase in the excitation power. The evaluations of the tangle and the linear entropy obtained from the measured density matrix indicate that the two-photon polarization density matrix can be expressed as the mixed state of an ideal state and a totally mixed state, and the mixture ratio of the totally mixed state increases as the excitation density increases. The variations of the density matrix and the mixture ratio with the excitation power originate from the generation of the multiple photon pairs. Furthermore, a numerical calculation considering simultaneous detection efficiency was able to reproduce the experimental results.
- Published
- 2019
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35. Four-body structure of neutron-rich hypernucleus 6ΛH
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Emiko Hiyama, Shota Ohnishi, Masayasu Kamimura, and Yasuo Yamamoto
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Physics ,Nuclear and High Energy Physics ,Low energy ,Error bar ,Structure (category theory) ,Cluster (physics) ,Neutron ,State (functional analysis) ,Atomic physics ,Ground state ,Hypernucleus - Abstract
The structure of heavy hyperhydrogen 6 Λ H is studied within the framework of a t n n Λ four-body cluster model. Interactions among the constituent subunits are determined so as to reproduce reasonably well the observed low energy properties of the t n , t Λ and tnn subsystems. As long as we reproduce the energy and width of 5 H within the error bar, the ground state of 6 Λ H is obtained as a resonant state.
- Published
- 2013
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36. Hyperon-Nucleon and Hyperon-Hyperon Interactions in Nuclei
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Yasuo Yamamoto, Toshio Motoba, Shinobu Nagata, Kiyomi Ikeda, and Hiroyuki Himeno
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Physics ,Particle physics ,Physics and Astronomy (miscellaneous) ,Gaussian ,High Energy Physics::Phenomenology ,Nuclear Theory ,Hyperon ,Nuclear physics ,Momentum ,symbols.namesake ,Quadratic form ,symbols ,Bibliography ,Order (group theory) ,Nuclear Experiment ,Nucleon ,Fermi Gamma-ray Space Telescope - Abstract
The G-matrices are derived on the basis of meson-theoretical hyperon-nucleon and hyperon-hyperon potentials from the Nijmegen group (model-D. model-F. soft-core model) and the Jiilich group (version-A, version-B). In order to make easy applications to hypernu· clei, they are parametrized to express in terms of three· range Gaussian radial functions with the density dependence being in the quadratic form of the Fermi momentum. Through the structure calculations of A-, 1:-, AAand ,S-hypernuclei, properties of these G-matrix interactions have been investigated in the AN, l:N, AA and EN channels, respectively.
- Published
- 2013
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37. Effects of a hyperonic many-body force on B-Lambda values of hypernuclei
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Yasuo Yamamoto, Th. A. Rijken, and M. Isaka
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Physics ,010308 nuclear & particles physics ,State (functional analysis) ,Nuclear matter ,Lambda ,01 natural sciences ,Many body ,Theoretical High Energy Physics ,0103 physical sciences ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,High Energy Physics ,Specific model ,Atomic physics ,010306 general physics ,Nucleon - Abstract
The stiff equation of state (EoS) giving the neutron-star mass of $2{M}_{\ensuremath{\bigodot}}$ suggests the existence of strongly repulsive many-body effects (MBE) not only in nucleon channels but also in hyperonic ones. As a specific model for MBE, the repulsive multi-Pomeron exchange potential (MPP) is added to the two-body interaction together with the phenomenological three-body attraction. For various versions of the Nijmegen interaction models, the MBE parts are determined so as to reproduce the observed data of ${B}_{\mathrm{\ensuremath{\Lambda}}}$. The mass dependence of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ values is shown to be reproduced well by adding MBE to the strong MPP repulsion, assuring the stiff EoS of hyperon-mixed neutron-star matter, in which $P$-state components of the adopted interaction model lead to almost vanishing contributions. The nuclear matter $\mathrm{\ensuremath{\Lambda}}N\phantom{\rule{4pt}{0ex}}G$-matrix interactions are derived and used in $\mathrm{\ensuremath{\Lambda}}$ hypernuclei on the basis of the averaged-density approximation (ADA). The ${B}_{\mathrm{\ensuremath{\Lambda}}}$ values of hypernuclei with $9\ensuremath{\le}A\ensuremath{\le}59$ are analyzed in the framework of antisymmetrized molecular dynamics with use of the two types of $\mathrm{\ensuremath{\Lambda}}N\phantom{\rule{4pt}{0ex}}G$-matrix interactions including strong and weak MPP repulsions. The calculated values of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ reproduce the experimental data well within a few hundred keV. The values of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ in $p$ states also can be reproduced well, when the ADA is modified to be suitable also for weakly bound $\mathrm{\ensuremath{\Lambda}}$ states.
- Published
- 2017
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38. Neutron-star radii based on realistic nuclear interactions
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Th. A. Rijken, Nobutoshi Yasutake, Toru Tamagawa, Takenori Furumoto, Hajime Togashi, and Yasuo Yamamoto
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Nuclear Theory ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Space (mathematics) ,01 natural sciences ,Nuclear Theory (nucl-th) ,Theoretical High Energy Physics ,0103 physical sciences ,High Energy Physics ,Nuclear Experiment ,010306 general physics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Mixing (physics) ,Physics ,Coupling constant ,Scattering ,Equation of state (cosmology) ,Hyperon ,Neutron star ,Variational method ,Astrophysics - Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Atomic physics - Abstract
The existence of neutron stars with $2M_\odot$ requires the strong stiffness of the equation of state (EoS) of neutron-star matter. We introduce a multi-pomeron exchange potential (MPP) working universally among 3- and 4-baryons to stiffen the EoS. Its strength is restricted by analyzing the nucleus-nucleus scattering with the G-matrix folding model. The EoSs are derived using the Brueckner-Hartree-Fock (BHF) and the cluster variational method (CVM) with the nuclear interactions ESC and AV18. The mass-radius relations are derived by solving the Tolmann-Oppenheimer-Volkoff (TOV) equation, where the maximum masses over $2M_\odot$ are obtained on the basis of the terrestrial data. Neutron-star radii $R$ at a typical mass $1.5M_\odot$ are predicted to be $12.3\!\sim\!13.0$ km. The uncertainty of calculated radii is mainly from the ratio of 3- and 4-pomeron coupling constants, which cannot be fixed by any terrestrial experiment. Though values of $R(1.5M_\odot)$ are not influenced by hyperon-mixing effects, finely-observed values for them indicate degrees of EoS softening by hyperon mixing in the region of $M\!\sim\!2M_\odot$. If $R(1.5M_\odot)$ is less than about 12.4 km, the softening of EoS by hyperon mixing has to be weak. Useful information can be expected by the space mission NICER offering precise measurements for neutron-star radii within $\pm 5\%$., Comment: 8 pages, 7 figures
- Published
- 2017
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39. Baryon–Baryon Interactions S = 0, −1, −2, −3, −4
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M. M. Nagels, Yasuo Yamamoto, and Th. A. Rijken
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Physics ,Coupling constant ,Particle physics ,Meson ,High Energy Physics::Phenomenology ,Nuclear Theory ,Hyperon ,Lambda ,Coupling (probability) ,Atomic and Molecular Physics, and Optics ,Baryon ,Pomeron ,Quantum mechanics ,Bound state ,Nuclear Experiment - Abstract
We review the extended-soft-core models ESC08, which at present are the most complete meson-exchange models for the baryon–baryon (BB) interactions. The ESC-model describes the nucleon–nucleon (NN), hyperon–nucleon (YN), and hyperon–hyperon (YY), in terms of meson-exchanges using (broken) SU(3,F)-symmetry. In this approach to baryon-baryon the dynamics is derived from (1) one-boson-exchanges (OBE), (2) two-meson-exchanges, and (3) meson-pair-exchanges, (4) multiple gluon-exchanges (MGE), and (5) quark-core effects. In the OBE-sector, special features are (a) the axial-vector meson potentials, and (b) the inclusion of a zero in the scalar- and axial- meson form-factors. Novel for the ESC08-versions is (a) the inclusion in MGE next to the pomeron the odderon-exchange, and (b) the analysis of possible (pronounced) effects of the appearance of forbidden six-quark configurations. With these ingredients a rather flexible dynamical model is constructed for the description of all BB-channels in the {8} × {8} SU(3,F)-representation. Namely, it appeared feasible to keep the meson coupling parameters of the model in accordance with the predictions of the quark-pair-creation model, with a clear dominance of the 3 P 0-mechanism. This is the case for the meson- and meson-pair-baryon coupling constants and the F/(F + D)-ratio’s as well. The NN, YN, and YY results for this model are excellent. This is marked in particular by the NN-results, namely $${\chi^2_{p.d.p.}}$$ = 1.180, 1.135, and 1.085 for, respectively, ESC08a, ESC08b, and ESC08c. These fits were achieved with partial-wave independent meson-coupling parameters in a combined fit of the $${NN \oplus YN}$$ -data, supplemented with information from G-matrix calculations of hypernuclei, e.g. $${B_\Lambda(^{6}_{\Lambda\Lambda}He)}$$ from the Nagara-event, and an attractive Ξ-nucleus interaction. The special quark-core effects provide ample repulsion in the Σ + p(3 S 1, T = 3/2)- and ΣN(1 S 0, T = 1/2)-channels, in particular for ESC08a,b. The well depths (U Λ , U Σ , U Ξ ) correspond rather well with expectations from hypernuclei. Here, in ESC08c a universal repulsion, which we derived from multiple pomeron-exchange, is necessary. This at the same time gives both a very satisfactory nuclear saturation point as well as a description of the neutron star matter in the presence of hyperons for all ESC08-models. The requirement of a sizable Ξ-nucleus attraction leads to the prediction of an S = −2 deuteron-state in ΞN(3 S 1, T = 1) with E B ≈ 8.3 MeV. Also possible/likely are similar bound states for Ξ N(3 S 1, T = 0), Λ Ξ, Σ Ξ(3 S 1, T = 1/2, 3/2), and Ξ Ξ(1 S 0, T = 1).
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- 2013
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40. Synthesis and Biological Evaluation of Thiophene-C-glucosides as Sodium-Dependent Glucose Cotransporter 2 Inhibitors
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Yuichi Koga, Kiichiro Ueta, Eiji Kawanishi, Chiaki Kuriyama, Yasuaki Matsushita, Sumihiro Nomura, Shigeki Sakamaki, and Yasuo Yamamoto
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biology ,Chemistry ,Chinese hamster ovary cell ,General Chemistry ,General Medicine ,Carbohydrate metabolism ,Inhibitory postsynaptic potential ,biology.organism_classification ,Excretion ,chemistry.chemical_compound ,Biochemistry ,Drug Discovery ,Thiophene ,Structure–activity relationship ,Cricetulus ,Cotransporter - Abstract
The synthesis and structure-activity relationship (SAR) of thiophene-C-glucosides have been explored, and the human sodium-dependent glucose cotransporter 2 (hSGLT2) inhibitory activities and rat urinary glucose excretion (UGE) effects of 3a-f were evaluated. As a result, they showed good hSGLT2 inhibitory activities and rat UGE effects. In particular, the chlorothiophene derivative 3f showed remarkable inhibitory activity against hSGLT2.
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- 2013
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41. {\xi} hypernucler states predicted by the new interaction model esc08c
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Yasuo Yamamoto, Th. A. Rijken, and Emiko Hiyama
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Physics ,Particle physics ,Theoretical High Energy Physics ,Hyperon ,Sigma ,Interaction model ,Lambda ,Nuclear matter ,Atomic and Molecular Physics, and Optics - Abstract
The features of the new interaction model ESC08c in \({\Lambda N}\), \({\Sigma N}\) and \({\Xi N}\) channels are demonstrated single hyperon potentials \({U_Y(Y=\Lambda, \Sigma, \Xi)}\) in nuclear matter on the basis of the G-matrix theory. (K−, K+) productions of \({\Xi}\) hypernuclei are studied with \({\Xi}\)-nucleus folding potentials.
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- 2013
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42. A Novel Needle Puncture Technique to the Renal Calyx using Laser-Assisted Ultrasound Scanning (LAUS) Method just before Percutaneous Nephrolithotomy: Preliminary Report
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Noritaka Ishito, Shohei Yokoyama, Yasuo Yamamoto, Tomoko Sako, Takaharu Ichikawa, Yoichi Shiotsuka, and Hitoshi Takamoto
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medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Ultrasound ,Needle puncture ,Laser assisted ,Surgery ,Renal calyx ,medicine.anatomical_structure ,Preliminary report ,medicine ,Radiology ,Percutaneous nephrolithotomy ,business - Published
- 2013
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43. Medium effect in high-density nuclear matter probed by a systematic analysis of nucleus-nucleus elastic scattering
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Yasuo Yamamoto, Yukinori Sakuragi, and Takenori Furumoto
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Physics ,Elastic scattering ,Nuclear Theory ,010308 nuclear & particles physics ,Scattering ,FOS: Physical sciences ,High density ,Nuclear matter ,01 natural sciences ,Nuclear Theory (nucl-th) ,Cross section (physics) ,medicine.anatomical_structure ,0103 physical sciences ,medicine ,Incident energy ,Nuclear Experiment (nucl-ex) ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Nucleus ,Nuclear theory - Abstract
We investigate the property of the high-density nuclear matter probed by the nucleus-nucleus elastic scattering in the framework of the double-folding (DF) model with the complex $G$-matrix interaction. The medium effect including three-body-force (TBF) effect is investigated with present two methods based on the frozen density approximation (FDA). The medium effect is clearly seen on the potential and the elastic cross section for the $^{16}$O + $^{16}$O system at $E/A =$ 70 MeV. The crucial role of the medium effect is also confirmed with other effective nucleon-nucleon ($NN$) interactions. In addition, the present methods are applied to other heavy-ion elastic scattering systems. Again, the medium effect is clearly seen in the heavy-ion elastic cross section. The medium effect on the elastic cross section becomes invisible with the increase of the target mass and the incident energy (up to $E/A =$ 200 MeV). However, the medium effect is again important to fix the heavy-ion scattering over $E/A =$ 200 MeV. Finally, we make clear the crucial role of the TBF effect up to $k_F =$ 1.6 fm$^{-1}$ in the nucleus-nucleus elastic scattering., 29 pages, 11 figures, accepted in Physical Review C. arXiv admin note: substantial text overlap with arXiv:1406.3718
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- 2016
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44. JTP-117968, a novel selective glucocorticoid receptor modulator, exhibits improved transrepression/transactivation dissociation
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Takashi Nakagawa, Atsuko Miyai, Takayuki Yamaguchi, Yuki Bessho, Katsuya Deai, Takahiro Hata, Yoshinori Kosugi, Mutsuyoshi Matsushita, Takafumi Kurimoto, Isao Tamai, Shohei Misaki, Yasuo Yamamoto, and Tamotsu Negoro
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0301 basic medicine ,Transcriptional Activation ,medicine.medical_specialty ,Aminopyridines ,Pharmacology ,Non steroidal ,03 medical and health sciences ,chemistry.chemical_compound ,Transactivation ,Mice ,Glucocorticoid receptor ,Receptors, Glucocorticoid ,In vivo ,Internal medicine ,medicine ,Fosdagrocorat ,Animals ,RNA, Messenger ,Transrepression ,Tyrosine Transaminase ,Mice, Inbred BALB C ,Trifluoromethyl ,In vitro toxicology ,Phenanthrenes ,030104 developmental biology ,Endocrinology ,chemistry ,Hepatocytes ,Female ,Phenanthrolines - Abstract
Classic glucocorticoids that have outstanding anti-inflammatory effects are still widely prescribed for the treatment of various inflammatory and autoimmune diseases. Conversely, glucocorticoids cause numerous unwanted side effects, particularly systemically dosed glucocorticoids. Therefore, selective glucocorticoid receptor modulator (SGRM), which maintains beneficial anti-inflammatory effects while reducing the occurrence of side effects, is one of the most anticipated drugs. However, there have been no SGRMs marketed to date. The assumption is that there are two major mechanisms of action of glucocorticoids via glucocorticoid receptors, transrepression (TR) and transactivation (TA). In general, the anti-inflammatory effects of glucocorticoids are mostly mediated through TR, while the side effects associated with glucocorticoids are largely caused by TA. We started to evaluate novel orally available SGRMs that maintain anti-inflammatory effects while minimizing adverse effects by favoring TR over TA. Based on this evaluation, we discovered JTP-117968, (4b'S,7'R,8a'S)-4b'-benzyl-7'-hydroxy-N-(2-methylpyridin-3-yl)-7'-(trifluoromethyl)-4b',6',7',8',8a',10'-hexahydro-5'H-spiro[cyclopropane-1,9'-phenanthrene]-2'-carboxamide, a non-steroidal SGRM. JTP-117968 has partial TR activity, but exhibits extremely low TA activity. The maximum TR efficacy of JTP-117968 was comparable to its structural analogue, PF-802, (4bS,7R,8aR)-4b-Benzyl-7-hydroxy-N-(2-methylpyridin-3-yl)-7-(trifluoromethyl)-4b,5,6,7,8,8a,9,10-octahydrophenanthrene-2-carboxamide, which is the active form of Fosdagrocorat that has been developed clinically as a first-in-class orally available SGRM. Remarkably, the TA activity of JTP-117968 was much weaker than PF-802 not only in in vitro assays, but also in in vivo mice experiments. These findings indicate that JTP-117968 exhibits improved TR/TA dissociation because the compound has significantly lower TA activity compared with an already reported SGRM. Therefore, JTP-117968 is expected to be a useful compound for evaluating ideal SGRMs in the future.
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- 2016
45. Competing effects of nuclear deformation and density dependence of theΛNinteraction inBΛvalues of hypernuclei
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Th. A. Rijken, Yasuo Yamamoto, and M. Isaka
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Physics ,Soft core ,010308 nuclear & particles physics ,0103 physical sciences ,Binding energy ,Deformation (engineering) ,Atomic physics ,010306 general physics ,Lambda ,01 natural sciences - Abstract
Competitive effects of nuclear deformation and density dependence of $\mathrm{\ensuremath{\Lambda}}N$ interaction in $\mathrm{\ensuremath{\Lambda}}$ binding energies ${B}_{\mathrm{\ensuremath{\Lambda}}}$ of hypernuclei are studied systematically on the basis of the baryon-baryon interaction model ESC (extended soft core) including many-body effects. By using the $\mathrm{\ensuremath{\Lambda}}N$ $G$-matrix interaction derived from ESC, we perform microscopic calculations of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ in $\mathrm{\ensuremath{\Lambda}}$ hypernuclei within the framework of the antisymmetrized molecular dynamics under the averaged-density approximation. The calculated values of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ reproduce experimental data within a few hundred keV in the wide mass regions from 9 to 51. It is found that competitive effects of nuclear deformation and density dependence of $\mathrm{\ensuremath{\Lambda}}N$ interaction work decisively for fine-tuning of ${B}_{\mathrm{\ensuremath{\Lambda}}}$ values.
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- 2016
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46. Wave Propagation Direction and c-Axis Tilt Angle Influence on the Performance of ScAlN/Sapphire-Based SAW Devices
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Abhay, Kochhar, Yasuo, Yamamoto, Akihiko, Teshigahara, Ken-Ya, Hashimoto, Shuji, Tanaka, and Masayoshi, Esashi
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Some previously reported surface acoustic wave (SAW) devices using bulk piezoelectric substrates showed higher acoustic power radiated in either forward or backward wave propagation direction depending on their crystal orientations and are called natural single-phase unidirectional transducers (NSPUDT). While these reports were based on bulk piezoelectric substrates, we report directionality in the c-axis tilted 44% scandium doped aluminum nitride thin piezoelectric film-based SAW devices on sapphire. It is worth noting that our observance of directionality is specifically in Sezawa mode. We produced a c-axis tilt up to 5.5° over the single wafer and examined the directionality by comparing the forward and backward insertion loss utilizing split finger electrodes as a receiver. The wave propagation direction and c-axis tilt angle influence on the performance of SAW devices is evaluated. Furthermore, return loss and insertion loss data are presented for various SAW propagation directions and c-axis tilt angles. Finally, the comparison for both acoustic modes, i.e., Rayleigh and Sezawa, is reported.
- Published
- 2016
47. Photoluminescence of excitons and biexcitons in (C 4 H 9 NH 3 ) 2 PbBr 4 crystals under high excitation density
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Hideki Ichida, Yasuo Yamamoto, Kohji Mizoguchi, Goro Oohata, and Yasuo Kanematsu
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Condensed Matter::Quantum Gases ,Photoluminescence ,Condensed Matter::Other ,Chemistry ,Exciton ,High density ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter Physics ,Condensed Matter::Materials Science ,Atomic physics ,Spectroscopy ,Excitation ,Quantum well ,Biexciton - Abstract
Optical properties in (C4H9NH3)2PbBr4 single crystals under high density excitation have been investigated by photoluminescence (PL) spectroscopy. The PL bands associated with the Γ1, Γ2 and Γ5 excitons and the biexcitons have been observed. While the Γ2 exciton and biexciton PL intensities are proportional to the 0.9 and 1.7 power of the excitation density, respectively, the Γ5 exciton PL intensity shows the nonlinear dependence on the excitation density. The excitation-density dependence of the PL bands is calculated by taking account of the dynamical change of the exciton and biexciton populations in an exciton-biexciton system consisting of two exciton states and a biexciton state. The calculated results well explain the nonlinear dependence of the Γ5 exciton PL intensity on the excitation density. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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- 2012
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48. Structure of 10 Be and 10 B Hypernuclei Studied with the Four-Body Cluster Model
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Emiko Hiyama and Yasuo Yamamoto
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Nuclear Theory (nucl-th) ,Physics ,Particle physics ,Physics and Astronomy (miscellaneous) ,Nuclear Theory ,Binding energy ,Cluster (physics) ,Structure (category theory) ,FOS: Physical sciences ,Charge (physics) ,Symmetry breaking ,Lambda ,Energy (signal processing) - Abstract
The structure of the isodoublet hypernuclei, $^{10}_��$B and $^{10}_��$Be within the framework of an $��+��+��+N$ four-body cluster model is studied. Interactions between the constituent subunits are determined so as to reproduce reasonably well the observed low-energy properties of the $����$, $��N$, $����$, $������$ and $����N$ subsystems. Furthermore, the two-body $��N$ interaction is adjusted so as to reproduce the $0^+$-$1^+$ splitting of $^4_��$H. The $��$ binding energies of $^{10}_��$B and $^{10}_��$Be are 8.76 MeV and 8.94 MeV, respectively. The energy splitting of the $1^-$-$2^-$ levels in $^{10}_��$B is 0.08 MeV, which does not contradict the experimental report in BNL-E930. An even-state $��N$ charge symmetry breaking (CSB) interaction determined from the A=4 systems works repulsively by +0.1 MeV (attractively by -0.1 MeV) in $^{10}_��$Be ($^{10}_��$B). We discuss a possibility that an odd-state CSB interaction improves the fitting to the experimental data of A=10 double $��$ hypernuclei., 20 pages and 7 fugures, To be published in Progress of Theoretical Physics
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- 2012
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49. Realistic Effective YN Interactions in Hypernuclear Models
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Yasuo Yamamoto and Th. A. Rijken
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Physics ,Particle physics ,Basis (linear algebra) ,Theoretical High Energy Physics ,Sigma ,Interaction model ,Hypernucleus ,Lambda ,Atomic and Molecular Physics, and Optics - Abstract
The features of the new interaction model ESC08 in ΛN, ΣN, ΛΛ and ΞN channels are demonstrated on the basis of the G-matrix theory.
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- 2012
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50. Dynamical Evolution of Heavy-Ion Scattering in the High-Energy Region
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Yukinori Sakuragi, Takenori Furumoto, and Yasuo Yamamoto
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Nuclear physics ,Physics ,High energy ,Physics and Astronomy (miscellaneous) ,Scattering ,Heavy ion - Published
- 2012
- Full Text
- View/download PDF
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